13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- Figure 13. Preload levels effect on FCGR for 6061 T6 Al-alloy at R=0.25 Figure 14. Variation of residual stress intensity factor Kr for preload levels of 6061 T6 Al-alloy 4. References [1] G. Glinka, “Residual stress in fatigue and fracture: Theoretical analyses and experiments”. In Niku-Lari A., Editor, Advances in Surfaces Treatments, Pergamon Press, 1987, 413-454. [2] Pavier, M.J., Poussard, C.G.C. and Smith, D.J., “Effect of residual stress around cold worked holes on fracture under superimposed mechanical load”, Engineering Fracture Mechanics, 63 (1999), 751-773. [3] Makabe, C., Purnowidodo A. and McEvily, A.J., “Effect of surface deformation and crack closure on fatigue crack propagation after overloading and under-loading”, International Journal of fatigue, 26 (2004), 1341-1348. [4] John, R., Jata K.V., and Sadananda, K., “Residual stress effects on near-threshold fatigue crack growth in friction stir welds in aerospace alloy”, International Journal of fatigue, 25 (2003), 939-948. 1,0E-08 1,0E-07 1,0E-06 1,0E-05 1,0E-04 1 10 100 da/dN (m/cycle) -12 -8 -4 0 4 8 0 0,005 0,01 0,015 0,02 0,025
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